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All that glitters

Diamond and colored gemstone jewels, including a yellow diamond necklace estimated to be worth $2 million to $3 million, are going on the block at Sotheby's "Magnificent Jewels" auction.

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Property of a West Coast Collector
Mystery-Set Ruby and Diamond Flower Brooch, Van Cleef & Arpels, Paris, 1967
Round and baguette diamonds weighing approximately 4.05 carats, the petals mystery-set with caliber-cut rubies, mounted in platinum and 18 karat gold
Est. $60/80,000

Precious petals

Diamond and colored gemstone jewels, including a yellow diamond necklace estimated to be worth $2 million to $3 million, will go on the block at Sotheby's "Magnificent Jewels" auction in New York on April 20, 2010.

This ruby and diamond flower brooch, originally from Van Cleef & Arpels, Paris, in 1967, contains round and baguette diamonds weighing approximately 4.05 carats. The petals are "mystery-set" with calibre-cut rubies, mounted in platinum and 18 karat gold. Van Cleef & Arpels created the mystery setting technique, in which prongs are concealed beneath the gems they hold.

Estimated value: $60,000 to 80,000

Michael Oldford
Property from the Collection of Patricia Kluge
Platinum, Sapphire and Diamond Ring
The cushion-shaped antique mixed-cut sapphire weighing approximately 21.30 carats, framed by round and single-cut diamonds weighing approximately 5.70 carats
Est. $200/300,000

True blue

The major highlight of Sotheby's Magnificent Jewels auction will be pieces from the collection of Virginia winemaker and philanthropist Patrcia Kluge, including this platinum, sapphire and diamond ring. The cushion-shaped sapphire, weighing approximately 21.30 carats, is framed by round and single-cut diamonds weighing approximately 5.7 carats.

Estimated value: $200,000 to $300,000

Michael Oldford
Lot 225
Pair of Platinum, Gold, Sapphire and Diamond Earclips
Set in the center with oval sapphires weighing approximately 46.35 and 42.35 carats, framed by old mine diamonds weighing approximately 10.75 carats.
Est. $100/150,000

Lot 233
Platinum, Emerald Bead and Diamond Necklace
Supporting a fringe of emerald bead pendants, supported by a necklace composed of emerald beads, total weight of emeralds approximately 665.00 carats, accented by round diamonds weighing approximately 43.00 carats
Est. $150/200,000

Diamonds are forever

The Sotheby's Magnificent Jewels auction will include a pair of earclips set with oval sapphires framed by old mine diamonds weighing approximately 10.75 carats; they are estimated to be worth $100,000 to $150,000. Also on the block: A necklace composed of emerald beads accented by round diamonds weighing approximately 43 carats. It is estimated to bring $150,000 to $200,000.

Michael Oldford
Platinum, Rose Gold, Moonstone, Diamond and Ruby Bird Brooch, Marcus & Co., Circa 1940
Depicting birds in flight, the wings set with segments of cabochon moonstones, accented by old European-cut, round and single-cut diamonds, and calibré-cut rubies, signed Marcus
Est. $25/35,000

Birds of a feather

Crafted around 1940, this brooch depicts birds in flight. The wings are set with segments of cabochon moonstones, accented by round and single-cut diamonds and calibré-cut rubies.

Estimated value: $25,000 to $35,000

Property from a Private Collection
A Magnificent Fancy Vivid Yellow Diamond Necklace 
Set with 42 GIA-certified Fancy Vivid yellow diamonds weighing a total of 100.17 carats
Est. $2/3 million

Dazzling diamonds

Sotheby's believes this to be the first necklace set entirely with fancy-vivid yellow diamonds ever to appear at auction. The 42 diamonds weigh a total of 100.17 carats.

Estimated value: $2 million to $3 million

Lot 545
Pair of Emerald and Diamond Pendant-Earrings
Pear-shaped emeralds weighing 10.58 and 9.76 carats, square cushion-shaped and round diamonds weighing approximately 2.50 carats, mounted in platinum.
Est. $350/450,000

Pear-shaped pair

These pendant earrings feature pear-shaped emeralds weighing 10.58 and 9.76 carats, and diamonds weighing approximately 2.50 carats, mounted in platinum.

Estimated value: $350,000 to $450,000

Platinum, Ruby, Sapphire, Emerald and Diamond Pendant-Watch, Mauboussin, France, Circa 1930
The jardinière suspended from a stylized bar pin, set with a table-cut ruby, cabochon and carved rubies, cabochon and carved sapphires, carved and buff top caliber-cut emeralds, and baguette and single-cut diamonds weighing approximately 2.00 carats, the reverse showing an oval dial with Arabic numerals, manual movement, signed Mauboussin, France
Est. $30/50,000

On the watch

This pendant watch takes the form of a jardiniere (a decorative receptacle for plants). It includes platinum, rubies, sapphires, emeralds and diamonds. The watch, an oval dial with Arabic numerals, is on the reverse side.

Estimated value: $30,000 to $50,000

Michael Oldford
Property of a Private Collector
18 Karat Gold, Platinum, Boulder Opal, Enamel, Colored Stone and Diamond Panther Bangle-Bracelet, David Webb
Composed of carved boulder opal segments, accented by round diamonds weighing approximately 3.00 carats, cabochon rubies and sapphire, and marquise-shaped emerald eyes, applied with blue enamel
Est. $40/60,000

Costly cat

This bangle bracelet is in the shape of a coiled panther. It is composed of carved boulder opal segments, accented by round diamonds weighing approximately 3 carats, cabochon rubies and sapphire, and emerald eyes.

Estimated value: $40,000 to $60,000

Property of a New York Collector
Diamond and Enamel Swallow Brooch/Hair Ornament Combination, Circa 1890
Rose-cut and old mine diamonds weighing approximately 1.00 carat, applied with white enamel, mounted in 10 karat gold
Est. $30/40,000

Wealth on wings

Dating to about 1890, this brooch/hair ornament is in the shape of a flying swallow. It has diamonds applied with white enamel, mounted in 10 karat gold.

Estimated value: $30,000 to $40,000

Michael Oldford
Property from a Private Collection
Emerald and Diamond Bracelet, Tiffany & Co., Circa 1925
The octagonal and rectangular step-cut emeralds weighing approximately 39.60 carats, spaced by square emerald-cut diamonds weighing approximately 9.50 carats, mounted in platinum
Est. $350/550,000

Verdant valuable

This Tiffany bracelet, dating to about 1925, includes emeralds weighing 39.60 carats, spaced by square emerald-cut diamonds weighing approximately 9.50 carats, mounted in platinum.

Estimated value: $350,000 to $550,000

Dietrich's diamonds

Dating to about 1930, this platinum and diamond brooch once belonged to actress Marlene Dietrich.

Estimated value: $30,000 to $50,000

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